TinEye is a reverse image search engine. The extension adds a context menu item so you can search for an image to find out where it came from, how it is being used, if modified versions of the image exist, or to find higher resolution versions.

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TinEye is the first image search engine on the web to use image identification technology rather than keywords, metadata or watermarks. When you submit an image to be searched, TinEye creates a unique and compact digital signature or 'fingerprint' for it, then compares this fingerprint to every other image in our index to retrieve matches. TinEye does not typically find similar images; it finds exact matches including those that have been cropped, edited or resized.